Preparation method of blending modified membrane for cesium removal of water body
A technology of blending modification and water body, which is applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of multiple control conditions, complicated preparation process, radioactive pollution of water body, etc., to avoid secondary pollution and have industrial application prospects Extensive, easy-to-use effects
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Embodiment 1
[0018] 1. Prepare 0.5mol / L ferric chloride solution, add citric acid (concentration is 0.25mol / L) wherein; prepare 0.5 m The potassium ferrocyanide solution of ol / L, wherein adds citric acid (concentration is 0.25mol / L).
[0019] 2. Heat the potassium ferrocyanide solution to 50°C, quickly add the ferric chloride solution dropwise into the potassium ferrocyanide solution, after fully reacting, refrigerate and centrifuge at 10,000rpm for 30min, and wash fully with distilled water to obtain 45nm Prussian blue particles.
[0020] 3. Dry polyvinylidene fluoride powder (Mw-534000), Prussian blue powder, polyvinylpyrrolidone and polyethylene glycol 2000 in an electric blast drying oven at 70°C for 12 hours to remove moisture.
[0021] 4. Add the solvent N,N dimethylacetamide (DMAc) and Prussian Blue (PB) powder into the three-necked flask in sequence at mass fractions of 74wt% and 1wt%, and mix them uniformly by ultrasonication for 30min, then add the additives Each of polyethylene...
Embodiment 2
[0027] Based on the blending method in Example 1, the only difference is that the mass fraction of nano-Prussian blue particles in the casting liquid is increased (see Table 1), and the prepared films are respectively marked as M2, M3, M4 and M5. This membrane was then subjected to the same flux and Cs element removal tests as in Example 1.
[0028] Raw material ratio of table 1 blend film
[0029]
[0030] The detailed results of blend membrane cesium removal and flux are compared in the following table 2:
[0031] Table 2 Comparison of blend membrane flux and cesium removal rate with different nano-Prussian blue contents
[0032]
[0033] Compared with the above experimental results, the M1-M5 membranes all have a certain cesium removal ability. M5 has a higher Prussian blue content, so it has higher cesium selective removal ability than M1, M2, M3 and M4 membranes, showing good applicability.
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